DE2146666A1 - Screen unit for an image pickup tube - Google Patents

Description

PATENT LAWYERS -2146666 Dipi.-chem. Dr. D. Thomsen Dipi.-ing. H. Tiedtke
Dipl.-Chem. Q. BÜhÜIig Dipl.-Ing. R. ΚΐΠΠθ MONKS 15
KAISER-LUDWIOhPLATZ
TEL 0811/530211
630212
TELEX: 5/24301 topat Dipi.-ing. W.Weinkauff FRANKFURT (MAIN) BO
FUCHSHOHL TI
TEL. 0611/51 «M

Reply requested to —Please reply to: 8000 Munich 15 September 17, 1971

Matsushita 'Electronics Corporation Osaka, Japan

Screen unit for an image pickup tube

The invention relates to an image pickup tube and, more particularly, to a screen unit of an image pickup tube. The "particular purpose of the invention is to provide an umbrella unit that is robust in construction and easily manufactured without damage to its screen substrate, which is made of a semiconductor material.

According to the invention, a screen unit of an image pickup tube with a tubular jacket has a transparent faceplate, an annular connecting member which, on the one hand, is connected to the inner surface of the faceplate and, on the other hand, to the open

End of the jacket is welded, an annular support member,

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that carries a screen substrate of the image pickup tube and on the Rear side of the faceplate is seated, with the support member ″ on its peripheral wall extending in the peripheral direction of this wall Has groove which is combined with the link; Furthermore, an annular signal ring is provided which the Covering jacket in the form of a cap and attached to it by means of an electrically conductive paint, the signal ring is in contact on an inner surface with the peripheral wall of the link.

The invention is explained in more detail below with reference to schematic drawings.

Pig. Fig. 1 is a sectional view of the screen unit according to the invention, showing this unit in front of the Use of pressure welding;

Pig. Fig. 2 shows the screen unit on an enlarged scale after pressure welding;

Pig. 3 is a diagrammatic representation of the screen unit covered by a signal ring.

Fig. 1 shows an arrangement which is eu to process a proper screen unit of invention and a transparent

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Has face plate 12. On one surface of the end plate 12 there is an annular connecting member 1 * 1, which "consists of indium and to which a tubular jacket 16 is attached with its one open end 18. An annular metallic support member 2o is arranged on the surface of the end plate and there preferably attached, for example by means of water glass; this support member carries a screen substrate 22. The substrate 22 sits on an offset inner wall of the support member 2o and is fixed there with the aid of an electrically conductive paint or cement or an electrically conductive solder 2k The circumferential wall has a circumferential groove 26. The groove 26 is preferably located opposite the inner wall of the annular connecting member Ik.

A suitable pressure is applied between the end plate 12 and the tubular jacket 16 in order to complete this arrangement into the screen unit according to the invention shown in FIG. 2. By applying such a pressure, the link Ik is deformed and in this way hermetically welded to the face plate 12 and the end 18. In this example, the deformed link enters the groove 26 of the support member 2o and is welded to it. The metallic support member 2o is thus attached to the support plate 12.

If necessary, the arrangement can be supplied with heat for pressure welding in addition to the pressure so that the bond

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deglied 14 enters the groove 26 more easily. The wall of the groove 26 can be plated with indium, tin or an alloy thereof in order to increase the robustness of the welded Connection between the groove 26 and the link 1 * 1 to raise.

Fig. 3 shows a unit Io according to FIG. 2, which with a cap is provided which is an annular signal ring; in this way it becomes an even more robust construction and beyond get better design of the umbrella unit. The signal ring 28 is on the peripheral wall of the link 18 and the Sheath 16 is attached and serves as an output terminal of the image pickup tube with the aid of a conductive paint 3o.

In the present case, the tubular jacket 16 is on its other end (not shown) is hermetically sealed so as to form a chamber for the free Passage of an electron beam can be evacuated. The electron beam is deflected by a suitable device, so that it scans the screen substrate 22 and thus an electrical image signal in the substrate in response generated by an optical image projected onto the substrate via the faceplate 12.

Aue of the above description it follows that the above special umbrella unit in a simple manner

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only a pressing process can be made and that the screen substrate is protected by the support member, so that the The shield substrate is not damaged by external mechanical forces and heat, as is necessary for the manufacture of the unit are needed. The screen unit or target unit according to the invention is therefore high in productivity.

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Claims (3)

2U6666 Claims Screen unit for an image pick-up tube with a tubular jacket, characterized by a transparent one Faceplate (12), an annular link (14) connected to the inner surface of the faceplate and having an open end (18) of the tubular jacket (16) is welded, an annular support member (2o) which has a screen substrate in its interior (22) carries the image pickup tube and sits on the back of the faceplate with the support member on its Circumferential wall has a groove (26) extending in the circumferential direction of this wall, which is combined with the connecting member, and by an annular signal ring that makes the jacket cap-shaped closes and is attached to this via an electrically conductive paint, the signal ring on its inner surface is in contact with the peripheral wall of the link. 2. umbrella unit according to claim 1, characterized in that the peripheral wall of the support member (2o) plated with indium is. 3. Schirmeinhe.it according to claim 1, characterized in that the peripheral wall of the support member (22) is plated with tin . 209813/1172 2U6666 U. screen unit according to claim 1, characterized in that the peripheral wall of the support member is plated with an alloy of indium and tin. 209813/1172 Le e rs ei te